Rails: Can you check the syntax for a simple string comparison method?

It compares the actual password stored in the database (@submission.password) with the password entered by the user from the view (params[:password]). If they are equal, the submission is deleted.

This is the string comparison method.

def compare_password
    if @submission.password == params[:password] # This line is wrong.
        @submission = Submission.find(params[:id])
        @submission.destroy
        redirect_to(@submission, :notice => 'Listing deleted successfully')
    else
        redirect_to(@submission, :alert => 'Password is incorrect.')
    end
end

This is the view.

<%form开发者_开发知识库_tag "/submissions/compare_password" do%>
<%=text_field_tag :password, params[:password]%>
<%=submit_tag "Delete"%>
<%end%>

Execution error I get is this.

undefined method `password' for nil:NilClass

edit

Originally my routes.rb looked like this

resources :submissions do
    collection do 

        post :compare_password
    end
end 

Now I changed to

resources :submissions do
    member do 

        post :compare_password
    end
end 

@submission is nil - you need to find this before checking the password value -

def compare_password
    @submission = Submission.find(params[:id]) # it is nil till you get it here
    if @submission && (@submission.password == params[:password])
        @submission.destroy
        redirect_to(@submission, :notice => 'Listing deleted successfully')
    else
        redirect_to(@submission, :alert => 'Password is incorrect.')
    end
end